SYMPTOMS

The flu usually comes on suddenly and may include these symptoms:

High fever
Headache
Tiredness/weakness (can be extreme)
Dry cough
Sore throat
Runny nose
Body or muscle aches
Diarrhea and vomiting also can occur, but are more common in children.

These symptoms are usually referred to as "flu-like symptoms." A lot of different illnesses, including the common cold, can have similar symptoms.

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